BREAKTHROUGH, step forward, ROOT cause, underlying cause, DIMINISHED hearing, impaired hearing, They STUCK probes, They inserted probes, THIN END OF THE WEDGE, slippery slope, CARRIED OUT a survey, undertook a survey, PAVE THE WAY FOR, lead to, to be DOWN to, due to, NEGATIVE side-effects, adverse, genetic CONDITION, genetic disorder, CREATED a way, devised

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